Concrete-mold.



PATENTED JULY 25. 1905.

G. F. LAMP.

CONCRETE MOLD.

APPLICATION FILED 00111. 1904.

6 c M c n r. W

M. f/P0212 111 PATENT OFFICE.

GEORGE F. LAMP, OF CARNEGIE, PENNSYLVANIA.

CONCRETE-MOLD.

Specification of Letters Patent.

Patented July 25, 1905.

Application filed October 11,1904. Serial No. 228,009.

To all 1072 0172, it may concern:

Be it known that I, GEORGE F. LAMP, a citizen of the United States ofAmerica, residing at Carnegie, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inConcrete- Molds, of which the following is a specification, referencebeing had therein to the accompanying drawings.

This invention relates to certain new and useful improvements inconcrete-molds, and more particularly to that class which are employedfor forming concrete building-blocks, paving-stones, and the like; andthe object of this invention is to provide a novel mold wherein anexpansible core is employed, and I so construct my improved mold thatthe same will be portable and can be readily manipulated when it isdesired to use the same.

Briefly described, my improved mold consists of a rectangular framewhich is supported by suitable standards, and to this frame I hinge in anovel manner, the sides of a box which comprises the base of the mold,and these sidesare secured together at their ends by suitable latches.Upon the sides forming the mold is supported another rectangular box,and in these boxes is placed an expansive core, which consists of threemembers, one of which is wedge-shaped and is keyed in the other twomembers, whereby, when it is raised, the members to which it is keyedare expanded, and I have constructed the different parts of my improvedmold upon as simple lines as possible to maintain a strong and durableconstruction which will withstand the rough usage to which devices ofthis character are generally subjected.

The above construction will be hereinafter specifically described,together with the details entering into the same, and then moreparticularly pointed out in the claims, and, referring to the drawingsaccompanying this application, like reference-numerals designatecorresponding parts throughout the several views, in which Figure 1 is aside elevation of my improved mold. Fig". 2 is a top plan view thereof.Fig. 3 is a longitudinal sectional view of my improved mold. Fig. 4 is adetail perspective view of the corner of the lower box of the mold,showing the latch employed for locking the sides thereof together. Fig.5 is a detail perspective view of said box, showing a set of hinges, theothers of which are broken away.

Fig. 6 is a perspective view of one of the end plates of my improvedmold, showing the manner of hinging the same; and Fig. 7 is a detailperspective view of a locking-pin employed in connection with the mold.

To put my invention into practice, I employ a suitable base 1, uponwhich the rectangular frame 2 is supported by the standards 3 3. Thisrectangular frame and the standards are preferably constructed oftubing, the base of each standard being provided with a keeper 4, andthe straight sections of tubing forming the rectangular frame aresecured together bythe elbows 5, in which are secured the standards 3 3.Hinged to the straight sections of tubing forming the rectangular frameare the sides 6 6, and the ends 7 7 are hinged to a section of tubing 7,that is slidably mounted on the straight sections. The box is hinged tothe frame by angular straps 8, attached by rivets 10 to the sides 6 ofthe box and provided on their outer ends with sleeves 9, in which theside rails 2 of the frame are received. A pair of these straps isprovided at each side of the box. The ends 7 7 each have a pair ofstraps 8' secured thereto, as by rivets 10, these straps being providedon their upper ends with sleeves 9 to receive the end rails 7 of theframe, which end rails 7 have sleeves 7 X to receive the side rails 2. Ahandle 11 is carried by each side member and each end member of the box.To secure the sides and ends together, I provide the sides withlatch-bars 11 11, which are slotted, as indicated at 12, and to theedges of the ends I secure the latches 14:, which are pivotally mounted,as indicated at 15, whereby they may be swung in engagement with thelatchbars 11. By employing these latch-bars and latches it will bepossible to maintain a reetangular box, as shown in Fig. 2 of thedrawings, and upon this box is adapted to rest the upper mold-box 16,which is similar in dimensions to the lower mold-box. The core which Iemploy comprises two end members 17 17 and a central vertical movingmember 18. The sides of the central member are inclined, as indicated at19, and the inner sides of the end members 17 17 have an inclinationcorresponding to the incline of the central member, and these innersides of the end members are provided with grooves 20, these groovesextending vertically in respect to the inclined sides. The centralmember 18 is provided with a headed pin 21, which protrudes at each sideinto the slots 20, as designated at 22, and the top of the centralmember 18 is provided with a suitable handle'QB.

It is to be noted that when the latches 14 are thrown inwardly outofengagement with the latch-bars 11 the sides and ends of the mold may beswung outwardly on their hinges by pulling outward on handles 11. i

To permit of smaller blocks being formed, I have provided means wherebythe ends of said box may be moved inwardly and locked in this positionduring the formation of a block. To this end I have slidably mounted theend plates upon the straight sections of pipe of the frame, and .l. haveprovided the sides of the box with apertures 24 24: and employ a pin 25for locking the ends in any position to which they have been moved. Thepin 25 is adapted to be inserted in an aperture of one of the sideplates and pass rearwardly of the end plate to the alining apertureformed in the other side plate. It of course will be understood that twopins similar to the pins designated by the reference numeral 25 areemployed, whereby both of the end plates may be moved inwardly andlocked in any desired position. 'hen these end plates are to beadjusted, the latches 1 L are swung inwardly, whereby they will notinterfere with the movement of the end plates when moving inwardly.\Vhen a block is to be formed in the mold just described, an uppermold-box of the same size as that to which the lower mold-box has beenadjusted is employed.

The manner of forming a concrete block is as follows: The hinged sidesand ends of the lower mold are assembled and locked in their respectivepositions by the latch -bars and latches, and then the upper mold-box 16is placed upon thelower box, at which time the core is placed within thebox. The device is now ready to receive the concrete, and it is placedaround the core between the sides and ends of themolding-box, and it isthoroughly tamped or compressed until the particles of concrete havebecome thoroughly packed within the box. After the composition has beenthoroughly compressed the central member 18 of the core is lifted bypulling upwardly on handle 23, causing the members 17 to be movedinwardly toward each other, and thereby contracting the core to such anextent as to permit its ready removal from the mold. The upper box 16 isthen removed and the latches removed from the keeper and the sides andends swung outwardly to the position shown in dotted lines of Fig. 3, atwhich time the whole framework can be removed and the concrete blockremoved to a suitable place where it will be permitted to harden anddry.

By employing a novel form of hinge I have provided means whereby whenthe sides and ends of the box are swung outwardly the concrete sidesformed will not be disfigured, owing to a part of the sides of the lowerbox leaving the concrete form gradually, and it will be seen that whenthese sides are swung outwardly the entire surface of the sidessimultaneously leaves the concrete form. In case it is not desired toform aeoncrete block with the core the core can be removed, and while Ihave herein shown the molding-boxes as being formed in two sections itis obvious that the same may be constructed in one or more sections.whereby different-sized blocks may be formed, if desired, and I may makesuch other changes in the details of construction as will be permittedby the appended claims.

Having fully described my invention, what I claim, and desire to secureby Letters Patent, is-

l. The combination of a base, standards secured thereon, a rectangularframe mounted on said standards and comprising side rails and end rails,a mold seated on the base, and embodying sides and ends, angular strapsattached to said sides and provided at their outer ends with sleevesengaging the side rails of the frame, straps attached to the ends, andhaving sleeves engaging the end rails of the frame, and a removableexpansible core for said mold, substantially as described.

2. In a device of the type described, a base, standards mounted thereon,a rectangular frame comprising side rails supported on the standards,and end rails having sleeves mounted on the side rails, a moldcomprising sides and ends, angular straps secured to the sides, andhaving sleeves engaging the side rails of the frame to swing thereon,straps attached to the ends of the mold and having sleeves engaging theend rails of the frame to swing thereon, and means for locking the sidesand ends of the mold in the closed position, substantially as described.

3. In a device of the type described, the combination with a frameembodying side and end rails, a mold embodying sides and ends, strapsattached to said sides and ends and sleeved on the side rails and endrails respectively of the frame, of an expansible core, comprising apair of end members and a central wedge IDOI'TlbOl, the end membershaving their inner faces inclined and provided with grooves, and thewedge member having its outer faces inclined reversely to the inclinedfaces of the end members, and headed pins carried by the wedge member towork in the grooves in the end members and draw said members together asthe wedge member is elevated, substantially as described.

In testimony whereof I affix my signature in the presence of twowitnesses.

GEORGE F. LAMP.

IVitnesses:

H. C. Evmt'r, E. E. POTTER.

